By Karla Bowsher I was raised by a doctor -- who is also board-certified in pharmacology -- and by a medical office manager. I also worked in a doctor's office for about a decade before going into journalism. What I learned from those experiences shapes my life, from what I eat to how I purchase medications. Below are prescription purchasing tips many people overlook, even though they can cut costs by much more than 50 percent. 1. Consider Over-the-Counter Options Few types of prescription medications have over-the-counter competitors. Still, it doesn't hurt to ask your doctor or pharmacist if your prescriptions have such alternatives. These drugs are often cheaper, and they might save you a doctor's appointment. For example, Consumer Reports recently reported that certain over-the-counter antihistamines are generally "equally effective at relieving symptoms" as prescription antihistamines. 2. Try Generics Gene…